package cn.sxt.controller;

import cn.sxt.entities.CommonResult;
import cn.sxt.entities.Payment;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author Mxb
 * @version 1.0
 * @date 2020/5/5 14:23
 */
@RestController
@Slf4j
public class CircleBreakerController {
    public static final String SERVICE_URL = "http://nacos-payment-provider";

    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/consumer/fallback/{id}")
    //@SentinelResource(value = "fallback")
    //fallback 只负责业务异常
    //@SentinelResource(value = "fallback",fallback = "handleFallback")
    //@SentinelResource(value = "fallback",blockHandler = "blockHandler")
    @SentinelResource(value = "fallback", fallback = "handleFallback", blockHandler = "blockHandler")
    public CommonResult<Payment> fallback(@PathVariable Long id) {
        CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/" + id, CommonResult.class, id);
        if (id == 4) {
            throw new IllegalArgumentException("IllegalArgumentException,非法参数异常....");
        } else if (result.getData() == null) {
            throw new NullPointerException("NullPointerException,该ID没有对应记录,空指针异常");
        }
        return result;
    }

    // fallback 回调方法
    public CommonResult handleFallback(@PathVariable Long id, Throwable e) {
        Payment payment = new Payment(id, "null");
        return new CommonResult(444, "兜底异常，exception内容：" + e.getMessage(), payment);
    }

    // 本例是blockHandler
    public CommonResult blockHandler(@PathVariable Long id, BlockException e) {
        Payment payment = new Payment(id, "null");
        return new CommonResult(445, "blockHandler-sentinel限流，无此流水：blockException" +
                e.getMessage(), payment);
    }
}